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vmstat: make vmstat_update deferrable 

Commit 0eb77e9880 ("vmstat: make vmstat_updater deferrable again and
shut down on idle") made vmstat_shepherd deferrable.  vmstat_update
itself is still useing standard timer which might interrupt idle task.
This is possible because "mm, vmstat: make quiet_vmstat lighter" removed
cancel_delayed_work from the quiet_vmstat.

Change vmstat_work to use DEFERRABLE_WORK to prevent from pointless
wakeups from the idle context.

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2016-02-05 15:36:27 -08:00 committed by Linus Torvalds
parent f01f17d370
commit ccde8bd401
1 changed files with 1 additions and 1 deletions
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2
mm/vmstat.c
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@ -1512,7 +1512,7 @@ static void __init start_shepherd_timer(void)
int cpu;
for_each_possible_cpu(cpu)
INIT_DELAYED_WORK(per_cpu_ptr(&vmstat_work, cpu),
INIT_DEFERRABLE_WORK(per_cpu_ptr(&vmstat_work, cpu),
vmstat_update);
if (!alloc_cpumask_var(&cpu_stat_off, GFP_KERNEL))